/*
 * OysterUtils.kt
 *
 * Copyright 2019 Michael Farrell <micolous+git@gmail.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package au.id.micolous.metrodroid.transit.oyster

import au.id.micolous.metrodroid.time.Epoch
import au.id.micolous.metrodroid.time.MetroTimeZone
import au.id.micolous.metrodroid.time.Timestamp
import au.id.micolous.metrodroid.util.ImmutableByteArray

object OysterUtils {
    private val EPOCH = Epoch.local(1980, MetroTimeZone.LONDON)

    fun parseTimestamp(buf: ImmutableByteArray, offset: Int = 0): Timestamp {
        val day = buf.getBitsFromBufferLeBits(offset, 15)
        val minute = buf.getBitsFromBufferLeBits(offset + 15, 11)
        return EPOCH.dayMinute(day, minute)
    }
}
